JP6271316B2 - Heat source equipment - Google Patents

Description

  The present invention relates to a heat source device, and more particularly to a heat source device that controls the number of heat source units.

  In air-conditioning equipment that uses heat source equipment such as chilled water heaters, in order to supply chilled water with the amount of heat according to the heat load, multiple heat source machines are connected in parallel and the number of heat source machines according to the heat load is operated. There is one in which the number control is performed (for example, see Patent Document 1).

JP-A-7-35386 (FIG. 1 etc.)

  In a system that controls the number of units, in order to prevent excessive start and stop of the heat source unit, the load confirmation that waits for a certain period of time after performing the stage of increasing or decreasing the stage after the condition for increasing or decreasing the stage is established Time is provided. However, if the load confirmation time is made constant, it takes time to supply cold / hot water having an appropriate amount of heat when the system is started under a high load condition or when the heat load changes suddenly. If the load confirmation time is set short, there is a possibility that the heat source machine is repeatedly started and stopped.

  In view of the above-described problems, the present invention provides a heat source device that can reduce the time required to reach an appropriate number of operating heat source units while suppressing repeated excessive start and stop of the heat source units. Objective.

  In order to achieve the above object, the heat source device according to the first aspect of the present invention includes, for example, a plurality of heat source devices 11 that adjust the temperature of the heat medium CHS supplied to the heat utilization device 91 as shown in FIG. A heat source device group 10 having a stand; a supply heat medium temperature detector 25 for detecting the temperature of the heat medium CHS supplied from the heat source device group 10 to the heat utilization device 91; and a plurality of heat source devices constituting the heat source device group 10 A control unit 12A for determining the number of operating units 11; the control unit 12A from when a condition for increasing or decreasing the heat source unit 11 is established to when increasing or decreasing the heat source unit 11 The load confirmation time is configured to change according to the deviation between the target temperature of the heat medium CHS supplied to the heat utilization device 91 and the supply temperature that is the temperature detected by the supply heat medium temperature detector 25. .

  With this configuration, the load confirmation time is changed according to the deviation between the target temperature and the supply temperature. Therefore, when starting up under low load conditions, etc. Reduces the time required to reach the proper number of operating heat source units by shortening the load confirmation time when starting the heat source device under high load conditions or when the heat load changes suddenly. It becomes possible to do.

  In addition, the heat source device according to the second aspect of the present invention is, for example, as shown in FIG. 1, in the heat source device 1 according to the first aspect of the present invention, the heat medium CHR introduced into the heat source machine group 10. The control unit 12A includes a deviation according to a temperature change rate, which is a change amount per predetermined time, of the temperature detected by the introduction heat medium temperature detector 26. And the load confirmation time are adjusted.

  If comprised in this way, the setting of the load confirmation time suitable for the tendency of the thermal load in a heat utilization apparatus can be performed.

  Moreover, when the heat source device according to the third aspect of the present invention is shown, for example, with reference to FIG. 1, FIG. 4 (A) and FIG. 4 (B), the heat source device 1 according to the second aspect of the present invention described above. When the temperature of the heat source device 11 is increased, the control unit 12A shortens the load confirmation time in the deviation from the standard when the temperature change rate is smaller than the standard value (straight line VS in FIG. 4A). (A broken line PS in FIG. 4B) When the temperature change rate is larger than the standard value (straight line VL in FIG. 4A), the load confirmation time in the deviation is made longer than the standard (FIG. 4B ) In the middle broken line PL).

  With this configuration, it is possible to further reduce the time required to reach the appropriate number of operating heat source units while suppressing excessive repetition of the heat source units.

  Moreover, when the heat source device according to the fourth aspect of the present invention is shown, for example, with reference to FIG. 1, FIG. 4 (A) and FIG. 4 (C), the second aspect or the third aspect of the present invention described above. In the heat source device 1 according to the control unit 12A, when the heat source device 11 is stepped down, the control unit 12A sets the load confirmation time in the deviation when the temperature change rate is larger than the standard value (straight line VL in FIG. 4A). When the temperature change rate is smaller than the standard value (straight line VS in FIG. 4A), the load confirmation time in the deviation is made longer than the standard. (A broken line QS in FIG. 4C).

  If comprised in this way, the action | operation of the safety device of a heat source machine can be avoided.

  Moreover, when the heat source device according to the fifth aspect of the present invention is shown, for example, with reference to FIGS. 1 and 5, the heat source according to any one of the first to fourth aspects of the present invention described above. In the apparatus 1, the control unit 12A divides the target temperature into a final target temperature Ttf that is the temperature of the heat medium CHS required by the heat utilization device 91 and a provisional target temperature Ttp between the supply temperature and the final target temperature. Thus, the supply temperature is set to reach the temporary target temperature Ttp before the final target temperature Ttf.

  If comprised in this way, the overshoot of the temperature of the heat medium supplied to a heat utilization apparatus can be suppressed.

  Moreover, when the heat source device according to the sixth aspect of the present invention is shown, for example, with reference to FIG. 1, in the heat source device 1 according to the fifth aspect of the present invention, the control unit 12 </ b> A has the provisional temperature as the provisional target. The amount of change in supply temperature per unit time from when the supply temperature exceeds the provisional target temperature until it reaches the final target temperature is smaller than the amount of change in supply temperature per unit time until the temperature is reached. Thus, the temporary target temperature and the final target temperature are set.

  If comprised in this way, the probability that the temperature of the heat medium supplied to a heat utilization apparatus will overshoot can be reduced.

  Further, as a heat source device according to the seventh aspect of the present invention, for example, referring to FIGS. 1 and 5, in the heat source device 1 according to the fifth aspect or the sixth aspect of the present invention, a control unit 12A may be configured to change the temporary target temperature Ttp so that the temporary target temperature Ttp approaches the final target temperature Ttf.

  If comprised in this way, the probability that the temperature of the heat medium supplied to a heat utilization apparatus will overshoot can further be reduced.

  ADVANTAGE OF THE INVENTION According to this invention, the time required to reach | attain the suitable operation number of a heat source machine can be shortened, suppressing the repetition of the excessive start / stop of a heat source machine.

1 is a schematic system diagram of a heat source device according to an embodiment of the present invention. It is a flowchart of the number control in the heat-source apparatus which concerns on embodiment of this invention. It is a graph which shows the example of the relationship between the difference of supply temperature and target temperature, and load confirmation time. (A) is a graph applied at the time of increasing steps, and (B) is a graph applied at the time of decreasing steps. It is a graph which shows the example of the relationship between the difference of supply temperature and target temperature adjusted according to the inlet_port | entrance temperature change rate, and load confirmation time. (A) is a graph which shows an inlet temperature change rate, (B) is a graph applied at the time of stage increase, (C) is a graph applied at the time of stage reduction. It is a graph explaining overshoot suppression control.

  Embodiments of the present invention will be described below with reference to the drawings. In the drawings, the same or similar members are denoted by the same or similar reference numerals, and redundant description is omitted.

  First, a heat source device 1 according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic system diagram of the heat source device 1. The heat source device 1 includes a heat source machine group 10 having a plurality of heat source machines 11 that adjust the temperature of cold / hot water CH as a heat medium as a main component. The cool / warm water CH is a medium that conveys heat used by the air conditioner 91 as a heat utilization device. When the air conditioner 91 performs cooling, the cold / warm water CH becomes cooled cold water, and the air conditioner 91 performs heating. Becomes heated hot water.

  In the present embodiment, the heat source machine group 10 includes three heat source machines 11 configured in the same manner: a first heat source machine 11A, a second heat source machine 11B, and a third heat source machine 11C. In this embodiment, when individually referring to the three heat source units 11 configured in the same manner, they are referred to as a first heat source unit 11A, a second heat source unit 11B, and a third heat source unit 11C, respectively. When referring to properties, they are collectively referred to as “heat source unit 11”. The heat source device 11 is a device that introduces the cold / hot water CH returned from the air conditioner 91, adjusts the temperature of the introduced cold / hot water CH, and supplies the cold / warm water CH to the air conditioner 91 again. In the following description, the cold / hot water CH whose temperature is adjusted by the heat source device 11 and supplied to the air conditioner 91 is referred to as “forward / warm water CHS”, and returns to the heat source device group 10 after the heat is used by the air conditioner 91. The incoming cold / hot water CH is referred to as “returned cold / warm water CHR”, and when the two are not distinguished, they are simply referred to as “cold / warm water CH”. The heat source device 11 is configured to be able to cool or heat the cold / hot water CH as necessary. Further, the heat source device 11 is configured to be able to change the degree of adjusting the temperature of the cold / hot water CH (temperature range to be lowered during cooling, temperature range to be raised during heating). In other words, the heat source device 11 is configured so that the output can be adjusted (capacity control can be performed). The heat source device 11 has means (not shown) for detecting the temperature of the return cold / hot water CHR to be introduced, and means (not shown) for detecting the temperature of the supplied cool / warm water CHS.

  The first heat source unit 11A is provided with a first control panel 12A. The first control panel 12A is configured to be able to control whether the first heat source unit 11A performs an operation for cooling the cold / hot water CH or an operation for heating the cold / hot water CH. Further, the first control panel 12A receives temperature signals from the temperature detection means of the return cold / warm water CHR and the temperature detection means (both not shown) of the first and second warm water CHS included in the first heat source machine 11A, and the first heat source machine 11A can be adjusted (capacity control). Further, the first control panel 12A can exchange control signals with other devices connected by signal cables, and can control operations of other devices that have transmitted control signals. It is configured. The first control panel 12A is connected to the first cold / hot water pump 13A as one of the other devices via a signal cable, and is configured to control the start / stop of the first cold / hot water pump 13A. Yes.

  In the first heat source machine 11A, one end of a first cool / warm water pipe 14A for flowing the cool / warm water CHS and one end of a first return cool / warm water pipe 17A for flowing the return cool / warm water CHR are respectively connected. A first cold / hot water pump 13A is disposed in the first return cold / hot water pipe 17A. 11 A of 1st heat source machines introduce | transduce return cold / warm water CHR via the 1st return cold / hot water pipe | tube 17A by starting of the 1st cold / hot water pump 13A, adjust the temperature of the introduced return cold / warm water CHR, and carry out warm / warm water CHS. As, it is comprised so that it can supply to 14 A of 1st going-cooling hot / cold water tubes.

  The second heat source machine 11B and the third heat source machine 11C are configured in the same manner as the first heat source machine 11A. The second heat source unit 11B is provided with a second control panel 12B, and is connected to one end of the second forward / cooling hot water pipe 14B and one end of the second return cold / hot water pipe 17B provided with the second cold / hot water pump 13B. ing. The area around the second heat source unit 11B is configured in the same manner as the area around the first heat source unit 11A. The second control panel 12B, the second cold / hot water pump 13B, the second outgoing / hot water pipe 14B, The two return hot / cold water pipes 17B have the same operations and functions as the first control panel 12A, the first cold / hot water pump 13A, the first forward / warm water / hot water pipe 14A, and the first return hot / cold water pipe 17A around the first heat source unit 11A. It is configured as follows.

  The third heat source unit 11C is provided with a third control panel 12C, and is connected to one end of the third cool / warm water pipe 14C and one end of the third return cold / hot water pipe 17C provided with the third cool / warm water pump 13C. ing. The area around the third heat source unit 11C is configured in the same manner as the area around the first heat source unit 11A. The third control panel 12C, the third cold / hot water pump 13C, the third forward / cooled hot water pipe 14C, around the third heat source unit 11C, The three return hot / cold water pipes 17C have the same operations and functions as the first control panel 12A, the first cold / hot water pump 13A, the first forward / warm water / hot water pipe 14A, and the first return hot / warm water pipe 17A around the first heat source unit 11A. It is configured as follows. Note that the first control panel 12A, the second control panel 12B, and the third control panel 12C have the same functions, and can control the capacity of the individual heat source units 11 provided in addition to the heat source unit group. In the present embodiment, the first control panel 12A is set as a master control panel, and the number of heat source machines 11 in the heat source machine group 10 is controlled. The overall control of the heat source device 1 is performed by the first control panel 12A.

  One end is connected to the first heat source / heater pipe 14A connected to the first heat source machine 11A, one end is connected to the second heat source machine 11B, the other end is connected to the second heat / hot water pipe 14B, and one end is connected to the third heat source machine 11C. The other ends of the connected third forward / cooling hot water pipes 14 </ b> C are connected to the forward header 15, respectively. One end of the first return cold / hot water pipe 17A connected to the first heat source machine 11A, the other end of the second return cold / hot water pipe 17B connected to the second heat source machine 11B, and the other end to the third heat source machine 11C. The other ends of the connected third return cold / hot water pipes 17 </ b> C are connected to the return header 16. The forward header 15 and the return header 16 are connected by a bypass pipe 18. A differential pressure adjusting valve 19 is disposed in the bypass pipe 18.

  The forward header 15 is configured such that the forward / cooled hot water CHS introduced from the heat source devices 11A, 11B, and 11C is mixed. The forward header 15 is connected to one end of a forward short pipe 24 through which the mixed cold / hot water CHS flows. The other end of the forward / rearward pipe 24 is connected to a load outgoing pipe 94 that guides the forward / cooled hot water CHS to the air conditioner 91. A secondary pump 92 that pumps the cold / hot water CHS toward the air conditioner 91 is disposed in the load outgoing pipe 94. The forward and short pipe 24 is provided with a supply thermometer 25 that detects the temperature of the forward and backward hot water CHS. The supply thermometer 25 corresponds to a supply heat medium temperature detector. The supply thermometer 25 is connected to the first control panel 12A through a signal cable, and is configured to transmit the detected temperature as a signal to the first control panel 12A.

  The return header 16 is connected to one end of a return short pipe 27 through which the returned cold / warm water CHR returned from the air conditioner 91 flows. The other end of the return short pipe 27 is connected to a load return pipe 97 that guides the return cold / warm water CHR discharged from the air conditioner 91 to the return header 16. The return short pipe 27 is provided with an inlet thermometer 26 that detects the temperature of the return cold / hot water CHR. The inlet thermometer 26 corresponds to an introduced heat medium temperature detector. The inlet thermometer 26 is connected to the first control panel 12A through a signal cable, and is configured to transmit the detected temperature as a signal to the first control panel 12A. The return header 16 is configured to be able to distribute the return hot / cold water CHR introduced from the air conditioner 91 to each of the first return cold / hot water pipe 17A, the second return cold / hot water pipe 17B, and the third return cold / hot water pipe 17C. Yes.

  With continued reference to FIG. 1, the operation of the heat source device 1 will be described. When a heat load to be processed occurs in the air conditioner 91 and the first control panel 12A, which is the master control panel, receives a command for requesting the supply of the cold / hot water CHS, the first control panel 12A starts with the first cold / hot water pump. 13A is started, and then the first heat source unit 11A is started. When the first cold / hot water pump 13A is activated, the cold / hot water CH flows through the first forward / cooling hot water pipe 14A and the first return cold / hot water pipe 17A. The temperature of the flowing cold / hot water CH is adjusted in the first heat source unit 11A in operation, and reaches the forward header 15 via the first forward / warm water / hot water pipe 14A as the forward / cooling hot water CHS. The cold / hot water CHS in the forward header 15 is transported to the air conditioner 91 by the secondary pump 92, and the heat held by the cold / hot water CHS is used by the air conditioner 91. The temperature of the cool / warm water CHS that has been used for heat rises when the air conditioner 91 performs cooling, and when the air conditioner 91 performs heating, the temperature decreases and becomes the return cold / warm water CHR. The return cold / hot water CHR which came out of the air conditioner 91 flows through the 1st return cold / hot water pipe 17A via the return header 16, and flows in into the 1st heat-source equipment 11A. The temperature of the return cold / hot water CHR that has flowed into the first heat source machine 11A is adjusted again to become the cold / warm water CHS, flows through the first cold / hot water pipe 14A toward the forward header 15, and thereafter repeats the above-described operation.

  When the operation of the first heat source unit 11A alone is insufficient for the heat load processing in the air conditioner 91, the first control panel 12A activates the second cold / hot water pump 13B and the second heat source unit 11B, It is made to act similarly to around the heat source unit 11A. If the operation of the two units of the first heat source unit 11A and the second heat source unit 11B is insufficient for the heat load processing of the air conditioner 91, the first control panel 12A causes the third cold / hot water pump 13C and the third heat source unit 11C to operate. They are activated and act in the same manner as around the first heat source unit 11A. On the other hand, when the operation of the plurality of heat source devices 11 becomes surplus in light of the heat load of the air conditioner 91, one heat source device 11 is stopped and the operation of one heat source device 11 becomes surplus. When the operation is stopped, the operation of all the heat source devices 11 is stopped. As described above, when the plurality of heat source units 11 are appropriately increased or decreased to operate an appropriate number corresponding to the heat load of the air conditioner 91, the heat source units 11 operate in a high efficiency region. It is possible to lengthen the running time, which is preferable.

  In the unit control in which an appropriate number of units are operated by increasing or decreasing the number of heat source units 11, in general, in order to prevent an excessive start / stop of the heat source unit 11, in general, the heat source unit in light of the heat load of the air conditioner 91. There is provided a load confirmation time for waiting for a predetermined time from when the condition for increasing or decreasing the number of steps 11 is established until the actual increase or decrease is performed. Since the load confirmation time is conventionally set to a certain time, when starting under a high load condition or when the heat load of the air conditioner 91 changes suddenly, the load confirmation time is set to an appropriate number for the heat load of the air conditioner 91. It took a considerable amount of time before the heat source device 11 was operated. On the other hand, when the load confirmation time is set short in order to shorten the time required to reach the appropriate number of operating heat source units 11 at the time of startup, for example, the amount of water held in the system is large, and the effect of increasing the heat source unit level When it takes time to appear, the start and stop of the heat source unit 11 may be repeated, and the significance of providing a load confirmation time for preventing the excessive start and stop of the heat source unit 11 will be lost. . In order to avoid such an inconvenience, the heat source device 1 performs the following control.

  FIG. 2 is a flowchart of the number control in the heat source device 1. In the following description, when referring to the configuration of the heat source device 1, FIG. 1 will be referred to as appropriate. The heat source device 1 can be controlled by any of the first control panel 12A, the second control panel 12B, and the third control panel 12C as described above. The control panel 12A is set as a master control panel, and the first control panel 12A is configured to perform the unit control described below. When the operation of the heat source device 1 is started, the first control panel 12A sets a flag (hereinafter referred to as a “condition continuation flag f”) for continuing that the conditions for increasing and decreasing the heat source device 11 are satisfied to 0. (S1). Next, the temperature of the cool / warm water CHS detected by the supply thermometer 25 (supply temperature Ts) and the temperature of the return cold / warm water CHR detected by the inlet thermometer 26 (inlet temperature Tr) are received as signals (S2). .

  Next, the first control panel 12A calculates the number of operating heat source devices 11 based on the supply temperature Ts and the temperature of the cool / warm water CHS supplied to the air conditioner 91 by design (target temperature Tt) ( S3). In the present embodiment, at the time of cooling, a condition for increasing the number of operating heat source devices 11 by 1 is established when the temperature obtained by subtracting the target temperature Tt from the supply temperature Ts exceeds 1 ° C., and the target temperature Tt is determined from the supply temperature Ts. It is assumed that the condition for reducing the number of operating heat source units 11 by one when the temperature obtained by subtracting the temperature is lower than −1 ° C. is satisfied. On the other hand, during heating, when the temperature obtained by subtracting the target temperature Tt from the supply temperature Ts falls below −1 ° C., the condition for increasing the number of operating heat source devices 11 is established, and the target temperature Tt is subtracted from the supply temperature Ts. It is assumed that the condition for reducing the number of operating heat source devices 11 by 1 when the temperature exceeds 1 ° C. is satisfied. After calculating the number of operating heat source devices 11, the first control panel 12A determines whether the condition continuation flag f is 1 or more (S4), and if not 1 or more, calculates the load confirmation time Sc (S5). .

  Here, the load confirmation time Sc in the number control of the heat source devices 1 will be described with reference to FIG. FIG. 3A is a graph showing the load confirmation time Sc at the time of increasing the stage, and FIG. 3B is a graph showing the load confirmation time Sc at the time of decreasing the stage. In both graphs, the horizontal axis represents the absolute value | Ts−Tt | of the difference between the supply temperature Ts and the target temperature Tt, and the vertical axis represents the load confirmation time Sc. As can be seen from FIG. 3, in the heat source device 1, the smaller the absolute value | Ts−Tt |, in other words, the closer the supply temperature Ts is to the target temperature Tt, the longer the load confirmation time Sc becomes. The load confirmation time Sc is changed according to the absolute value | Ts−Tt | of the difference between the target temperature Tt and the target temperature Tt. At this time, if the target temperature Tt is used as a reference, it can be said that the load confirmation time Sc is changed according to the deviation of the supply temperature Ts from the target temperature Tt. Thus, when the difference between the supply temperature Ts and the target temperature Tt is large, the heat source unit 11 is increased or decreased at short intervals, and conversely, the difference between the supply temperature Ts and the target temperature Tt is increased. When it is small, it is possible to lengthen the interval until the heat source device 11 is increased or decreased, thereby suppressing the occurrence of overshoot. The load confirmation time Sc is set to a minimum value from the viewpoint of avoiding simultaneous activation of the heat source device 11, and the load confirmation time Sc is set to the minimum value in a region where the absolute value | Ts−Tt | It is going to be fixed to. In addition, the load confirmation time Sc becomes the minimum value at the time of step reduction shown in FIG. 3B until the absolute value | Ts−Tt | becomes smaller than that at the time of step increase shown in FIG. . In order to avoid excessive supply of cold / hot water CH, the heat source apparatus 11 includes a safety device that stops the heat source apparatus 11 according to the upper and lower limits of the temperature of the cold / hot water CH determined as appropriate. -Tt | and the load confirmation time Sc, if the step is reduced, the heat source device 11 may stop due to the operation of the safety device, so the step shown in FIG. In addition, it is set in a direction that makes it easier to step down. The relationship between the absolute value | Ts−Tt | and the load confirmation time Sc shown in the graph of FIG. 3 is stored in the first control panel 12A in advance.

  Returning to FIG. 2 again, the description of the number control of the heat source devices 1 will be continued. When the first control panel 12A calculates the load confirmation time Sc in light of the relationship shown in FIG. 3, the result of calculating the number of operating heat source devices 11 (S3) is that the condition for increasing the heat source device 11 is the condition. It is determined whether or not it is established (whether or not the first control panel 12A determines that the heat source unit 11 should be increased) (S6). If the condition for increasing the stage is satisfied, it is determined whether or not the load confirmation time Sc calculated in the step (S5) has elapsed since the condition was satisfied (S7). If the load confirmation time Sc has not elapsed, 1 is added to the condition continuation flag f (S8), and then the process returns to the step of detecting the supply temperature Ts and the inlet temperature Tr (S2), and the number of operating heat source devices 11 The process proceeds to the step of calculating (S3). Then, in the step (S4) for determining whether or not the condition continuation flag f is 1 or more, if it is 1 or more, the step (S5) for calculating the load confirmation time Sc is skipped and the heat source unit 11 is increased. It progresses to the process (S6) which judges whether conditions are satisfied.

  In the step (S6) for determining whether or not the condition for increasing the heat source unit 11 is satisfied, if the condition for increasing the stage is satisfied (if the condition continuation flag f is 1 or more, the condition is already satisfied). It is determined whether or not the calculated load confirmation time Sc has elapsed in the step (S5) from the time when the condition is satisfied (S7). If the load confirmation time Sc has elapsed, the heat source It is determined whether all the machines 11 are operating (S9). When all the heat source devices 11 are operating, the condition continuation flag f is set to 0 (S10), and the process returns to the step (S2) of detecting the supply temperature Ts and the inlet temperature Tr again. Note that the condition continuation flag f is set to 0 when the number of heat source units 11 is operating when the load confirmation time Sc has elapsed since the condition for increasing the number of heat source units 11 is established. Rather than waiting for the load confirmation time Sc to elapse in a state in which the number of stages cannot be increased, a new load confirmation time Sc can be quickly applied when the calculated number of operating heat source devices 11 (S3) changes. It is to do. In the step of determining whether or not all the heat source units 11 are operating (S9), if not all the units are operating, the first control panel 12A increases the number of the heat source units 11 (S11). . When the heat source device 11 is increased, the condition continuation flag is set to 0 (S12), and the process returns to the step (S2) of detecting the supply temperature Ts and the inlet temperature Tr.

  In the step (S6) of determining whether or not the condition for increasing the heat source device 11 is satisfied, if the condition for increasing the temperature is not satisfied, the condition for decreasing the heat source device 11 is satisfied. (S13). It is determined whether the first control panel 12A has determined that the heat source unit 11 should be stepped down (S13). If the condition for reducing the stage is not satisfied, the condition continuation flag is set to 0 (S14), and the process returns to the step of detecting the supply temperature Ts and the inlet temperature Tr (S2). On the other hand, in the step (S13) of determining whether or not the condition for reducing the heat source 11 is satisfied, if the condition for decreasing is satisfied, the process (S5) It is determined whether or not the load confirmation time Sc calculated in (1) has elapsed (S15). If the load confirmation time Sc has not elapsed, 1 is added to the condition continuation flag f (S16), and the process returns to the step of detecting the supply temperature Ts and the inlet temperature Tr (S2) again. On the other hand, in the step (S15) for determining whether or not the load confirmation time Sc has elapsed, if the load confirmation time Sc has elapsed, it is determined whether or not two or more heat source devices 11 are operating ( S17). When operating two or more units, the first control panel 12A reduces the stage of the heat source unit 11 (S18). When the heat source device 11 is destaged, the condition continuation flag is set to 0 (S19), and the process returns to the step of detecting the supply temperature Ts and the inlet temperature Tr (S2). On the other hand, in the step of determining whether or not two or more heat source units 11 are operating (S17), if two or more units are not operating, the first control panel 12A stops the last one, that is, the heat source unit. The operation of the group 10 is stopped (S20), and the number control of the heat source devices 1 is finished.

  As described above, according to the heat source device 1 according to the present embodiment, when the difference between the supply temperature Ts and the target temperature Tt is large, an appropriate number of heat source machines can be obtained by shortening the load confirmation time Sc. It is possible to shorten the time required until 11 is operated. On the other hand, when the difference between the supply temperature Ts and the target temperature Tt is small, excessive start / stop of the heat source unit 11 can be suppressed by increasing the load confirmation time Sc.

  By the way, the time required until an appropriate number of the heat source units 11 are operated and the excessive start / stop of the heat source unit 11 are effectively suppressed by the heat source device 1 and the secondary side (air conditioner 91). ) And the amount of cold / hot water CH circulated (the amount of retained water), the utilization of heat on the secondary side (air conditioner 91), and the like. For example, when the amount of change per unit time of the temperature of the return cold / hot water CHR introduced into the heat source machine group 10 (hereinafter referred to as “inlet temperature change rate”) is large, the temperature of the cool / warm water CHS after the temperature adjustment by the heat source machine 11. Tends to be close to the target temperature Tt, it is preferable to increase the load confirmation time Sc from the viewpoint of stability when the heat source unit 11 is increased, and when the heat source unit 11 is decreased, the overshoot suppression is suppressed. From the viewpoint, it is preferable to shorten the load confirmation time Sc. In contrast, when the rate of change in the inlet temperature is small, it is preferable to shorten the load confirmation time Sc when the heat source device 11 is increased, and to increase the load confirmation time Sc when the heat source device 11 is decreased. it can.

  FIG. 4 shows a graph when the load confirmation time Sc is adjusted according to the inlet temperature change rate. 4A is a graph showing the inlet temperature change rate, FIG. 4B is a graph showing the load confirmation time Sc at the time of increasing the stage, and FIG. 4C is a graph showing the load confirmation time Sc at the time of decreasing the stage. is there. In the graph of the inlet temperature change rate shown in FIG. 4A, time is taken on the horizontal axis, and the amount of change in temperature (inlet temperature Tr) detected by the inlet thermometer 26 is taken on the vertical axis. In FIG. 4 (A), the straight line VM is the one in which the inlet temperature Tr changes by Δt ° C. (for example, 0.5 ° C.) when a predetermined time Sp (for example, 60 seconds) has elapsed, and this is the standard value. . The straight line VM can be determined, for example, that 10% of the rated value (for example, 5 ° C. difference) of the inlet / outlet temperature difference of the heat source device 11 has changed at the predetermined time Sp. The straight line VL indicates that the inlet temperature Tr has changed by 2 × Δt ° C. (for example, 1.0 ° C.) when the predetermined time Sp has elapsed, and the inlet temperature change rate is larger than the standard (straight line VM). ing. The straight line VS is obtained by changing the inlet temperature Tr by 1/2 × Δt ° C. (for example, 0.25 ° C.) when the predetermined time Sp has elapsed, and the inlet temperature change rate is smaller than the standard (straight line VM). Is shown.

  The graphs shown in FIGS. 4B and 4C are similar to the graphs shown in FIGS. 3A and 3B, and the horizontal axis indicates the absolute value of the difference between the supply temperature Ts and the target temperature Tt. Ts−Tt | is taken, and the load confirmation time Sc is taken on the vertical axis. The broken line PM in FIG. 4B shows the relationship between the absolute value | Ts−Tt | and the load confirmation time Sc when the inlet temperature change rate (see FIG. 4A) is standard (straight line VM). Which coincides with the broken line shown in FIG. The broken line PL shows the relationship between the absolute value | Ts−Tt | and the load confirmation time Sc when the inlet temperature change rate is larger than the standard (straight line VL), and the load confirmation time Sc is relatively larger than the standard time. Is set longer. The broken line PS shows the relationship between the absolute value | Ts−Tt | and the load confirmation time Sc when the inlet temperature change rate is smaller than the standard (straight line VS), and the load confirmation time Sc is relatively larger than the standard time. Is set short. The broken line QM in FIG. 4C shows the relationship between the absolute value | Ts−Tt | and the load confirmation time Sc when the inlet temperature change rate (see FIG. 4A) is standard (straight line VM). Which coincides with the broken line shown in FIG. The broken line QL indicates the relationship between the absolute value | Ts−Tt | and the load confirmation time Sc when the inlet temperature change rate is larger than the standard (straight line VL), and the load confirmation time Sc is relatively larger than the standard time. Is set short. The broken line QS shows the relationship between the absolute value | Ts−Tt | and the load confirmation time Sc when the inlet temperature change rate is smaller than the standard (straight line VS), and the load confirmation time Sc is relatively larger than the standard time. Is set longer.

  In addition, adjusting the capacity control of the heat source unit 11 also contributes to the suppression of overshoot. For example, when the difference between the supply temperature Ts and the target temperature Tt is large, increasing the output of the heat source device 11 increases the supply temperature Ts closer to the target temperature Tt, while the supply temperature Ts passes the target temperature Tt. There is a possibility of overshoot. Therefore, in order to suppress overshoot, the following control may be performed.

  FIG. 5 is a graph for explaining overshoot suppression control. In the graph shown in FIG. 5, time is taken on the horizontal axis and temperature is taken on the vertical axis. In the graph shown in FIG. 5, the actual measurement line Er indicates the temperature detected by the supply thermometer 25 (supply temperature Ts), and the set value line Es indicates the set value of the temperature of the forward / cooling hot water CHS. In the overshoot suppression control in the heat source device 1, the target temperature Tt is divided into a final target temperature Ttf and a provisional target temperature Ttp. The final target temperature Ttf is the temperature of the forward / cooled hot water CHS required by the air conditioner 91, and corresponds to the “target temperature Tt” described so far with reference to FIGS. The temporary target temperature Ttp is an arbitrary temperature provisionally provided between the supply temperature Ts and the final target temperature Ttf.

  The graph shown in FIG. 5 shows an example of cooling the cold / hot water CH. For example, as can be seen from the temperature T0 at time S0, the supply temperature Ts indicated by the actual measurement line Er is largely deviated from the final target temperature Ttf at the beginning (up to about time S1). The first control panel 12A initially sets the temperature T1 between the supply temperature Ts and the final target temperature Ttf as the temporary target temperature Ttp, as indicated by the set value line Es. Here, even if the temperature T1 initially set as the temporary target temperature Ttp starts to decrease the output of the heat source unit 11 after the supply temperature Ts reaches the temperature T1, the supply temperature subsequently changes to the final target temperature Ttf. The temperature may be as close to the final target temperature Ttf as possible within a range that does not fall below. When the supply temperature Ts decreases to the temperature T1 initially set as the temporary target temperature Ttp at time S1, the first control panel 12A decreases the temporary target temperature Ttp by a predetermined temperature per unit time. Re-set as needed. This is continued until the supply temperature Ts reaches the final target temperature Ttf (from time S1 to time S2 in FIG. 5). After the supply temperature Ts reaches the final target temperature Ttf, the set value line Es coincides with the final target temperature Ttf.

  Thus, the probability that the supply temperature Ts overshoots can be reduced by gradually bringing the provisional target temperature Ttp closer to the final target temperature Ttf. In the graph shown in FIG. 5, after the supply temperature Ts reaches the temperature T1 initially set as the provisional target temperature Ttp, the provisional target temperature Ttp is proportionally (linearly) toward the final target temperature Ttt. Although the temperature is lowered, the temporary target temperature Ttp is lowered toward the final target temperature Ttf in a curved line such that the decrease width of the temporary target temperature Ttp per unit time becomes smaller as time elapses. Alternatively, the temporary target temperature Ttp may be kept constant for an arbitrary unit time, and may be lowered stepwise so that the predetermined temperature is lowered at a stroke when the arbitrary unit time has elapsed. . Alternatively, the temporary target temperature Ttp may be set to only the initially set temperature T1, and the final target temperature Ttf may be aimed when the actual measurement line Er passes the temperature T1. At this time, after the supply temperature Ts exceeds the provisional target temperature Ttp (temperature T1) than the amount of change in the supply temperature Ts per unit time until the supply temperature Ts reaches the provisional target temperature Ttp, the final target temperature Ttt is reached. The provisional target temperature Ttp and the final target temperature Ttf may be set so that the amount of change in the supply temperature Ts per unit time until it reaches is smaller. The overshoot suppression control as described above is particularly effective at start-up when the difference between the supply temperature Ts and the final target temperature Ttf tends to be large, but can also be applied during steady operation other than at start-up. .

  In the above description, the heat source unit 11 is one that can selectively generate either cold or hot according to the situation (for example, a cold / hot water generator), but a heat source that generates only cold (for example, a cold / hot water generator) (Refrigerator) or a heat source machine (for example, a heat pump in a narrow sense) that generates only heat.

  In the above description, the heat source unit group 10 is composed of three heat source units 11, but may be composed of a plurality of heat source units 11 other than three, such as two or five units. Good.

  In the above description, the forward header 15 and the return header 16 are provided. However, instead of the header, another pipe may be connected to one pipe (for example, the first forward / cooling hot water pipe 14A). At this time, the pipe to which other pipes are connected should have a large diameter at the junction.

  In the above description, the heat utilization device is an air conditioner (air handling unit). However, the heat source device 1 supplies the cold / hot water CHS to devices other than the air conditioner, such as a fan coil and a refrigerated showcase. Is also possible.

  In the above description, the heat medium is the cold / hot water CH, but it may be cold water or hot water, or may be a fluid such as an antifreeze other than water.

  In the above description, the operation is started in the order of the first heat source unit 11A, the second heat source unit 11B, and the third heat source unit 11C. However, for load leveling, the cumulative operation time until then is small. It is good also as changing the starting order of the several heat-source equipment 11 suitably, such as starting an operation | movement in order. In addition, if it is made to perform the operation | movement from which a cumulative operation time differs, it can avoid that a maintenance time comes simultaneously to several heat-source equipment.

  In the above description, the number of operating heat source units 11 is calculated based on the temperature of the forward / cooled hot water CHS detected by the supply thermometer 25, but based on the temperature of the return cold / hot water CHR detected by the inlet thermometer 26. Thus, the number of operating heat source devices 11 may be calculated. When calculating the number of operating heat source devices 11 based on the temperature of the return cold / hot water CHR detected by the inlet thermometer 26, typically, the air conditioner in addition to the temperature of the return cold / hot water CHR detected by the inlet thermometer 26 The number of operating heat source units 11 necessary for the heat load processing in the air conditioner 91 is calculated from the target temperature Tt of the forward / cooled hot water CHS supplied to 91, the rated specification temperature difference of the heat source unit 11, and the number of installed heat source units 11. The

  In the above description, during cooling, when the temperature obtained by subtracting the target temperature Tt from the supply temperature Ts exceeds 1 ° C., the condition for increasing the number of operating heat source devices 11 is established, and the target temperature Tt is calculated from the supply temperature Ts. When the subtracted temperature falls below −1 ° C., the condition for reducing the number of operating heat source units 11 by 1 is established. During heating, the heat source is obtained when the temperature obtained by subtracting the target temperature Tt from the supply temperature Ts falls below −1 ° C. When the condition for increasing the number of operating units 11 is established, and when the temperature obtained by subtracting the target temperature Tt from the supply temperature Ts exceeds 1 ° C., the condition for decreasing the number of operating units of the heat source unit 11 is satisfied. However, the temperature difference that satisfies the condition for increasing or decreasing the heat source device 11 may be changed as appropriate.

  In the above description, the supply heat medium temperature detector is configured by the supply thermometer 25. However, the supply heat medium temperature detector is configured by the temperature detection means (not shown) of the cold / hot water CHS included in each heat source unit 11. May be. In this case, instead of the temperature detected by the supply thermometer 25, the average value of the temperatures detected by the temperature detection means (not shown) of the cooling / heating water CHS that each heat source device 11 has is used. The thermometer 25 may be omitted. In addition, although the introduction heat medium temperature detector is configured by the inlet thermometer 26, it is configured by temperature detection means (not shown) of the return cold / hot water CHR included in each heat source unit 11. Also good. In this case, instead of the temperature detected by the inlet thermometer 26, the average value of the temperatures detected by the temperature detection means (not shown) of the return cold / hot water CHR included in each heat source device 11 is used. The thermometer 26 may be omitted.

  In the above description, the first control panel 12A controls the operation of the heat source device 1 including the number control of the heat source units 11, but the second control panel 12B or the third control panel 12C is set as the master control panel. Then, the operation of the heat source device 1 may be controlled. Alternatively, each of the first control panel 12A, the second control panel 12B, and the third control panel 12C individually performs on / off and capacity control of the heat source unit 11 to which they belong, and controls the heat source device 1. It is good also as providing the control apparatus to perform separately.

DESCRIPTION OF SYMBOLS 1 Heat source apparatus 10 Heat source machine group 11 Heat source machine 12A 1st control panel 25 Supply thermometer 26 Inlet thermometer 91 Air conditioner CHS Cooling hot water Ttf Final target temperature Ttp Temporary target temperature

Claims (7)

A heat source unit group having a plurality of heat source units for adjusting the temperature of the heat medium supplied to the heat utilization device;
A supply heat medium temperature detector for detecting the temperature of the heat medium supplied from the heat source unit group to the heat utilization device;
The operating number of the plurality of heat source units constituting the heat source unit group is a target temperature of the heat medium supplied to the heat utilization device and a supply temperature that is a temperature detected by the supply heat medium temperature detector. And a control unit that determines based on :
The controller determines the load confirmation time from when the condition for increasing or decreasing the heat source unit is satisfied to when the heat source unit is actually increased or decreased , to determine the number of operating heat source units. determined in accordance with the deviation between before Symbol goals temperature before bellflower supply temperature used to, then it is determined whether a condition for performing the multiplication stage or decrease stage of the heat source equipment is established, the heat source When the required load confirmation time has elapsed since it was determined that the conditions for increasing or decreasing the heat source apparatus were satisfied when the conditions for increasing or decreasing the machine were satisfied wherein it is configured so that it is the boosted stage or decrease stage of the heat source machine;
The condition for increasing or decreasing the heat source unit is configured to be satisfied when the difference between the supply temperature and the target temperature is not within a preset range;
Heat source device.   The control unit increases or decreases the heat source unit between the time when it is determined that the condition for increasing or decreasing the heat source unit is satisfied and the time when the obtained load confirmation time elapses. It is configured to newly calculate the load confirmation time when the condition for performing the step is not satisfied;
  The heat source device according to claim 1. An introduction heat medium temperature detector for detecting the temperature of the heat medium introduced into the heat source machine group;
The control unit adjusts the relationship between the deviation and the load confirmation time according to a temperature change rate that is a change amount per predetermined time of the temperature detected by the introduction heat medium temperature detector. Composed;
The heat source device according to claim 1 or 2 . The control unit, when increasing the heat source unit, if the rate of temperature change is smaller than a standard value, the load confirmation time in the deviation is shorter than the standard, the rate of temperature change is less than the standard value Configured to make the load check time at the deviation longer than normal when larger;
The heat source device according to claim 3 . When the temperature change rate is larger than a standard value when the heat source unit is stepped down, the control unit shortens the load confirmation time in the deviation from the standard, and the temperature change rate is lower than the standard value. Configured to make the load confirmation time at the deviation longer than standard when small;
The heat source device according to claim 3 or 4 . The control unit divides the target temperature into a final target temperature that is a temperature of the heat medium required by the heat utilization device, and a provisional target temperature between the supply temperature and the final target temperature, Setting the supply temperature to reach the provisional target temperature before the final target temperature;
The heat source device according to any one of claims 1 to 5 . The control unit reaches the final target temperature after the supply temperature exceeds the temporary target temperature, rather than the amount of change in the supply temperature per unit time until the supply temperature reaches the temporary target temperature. The provisional target temperature and the final target temperature are set so that the amount of change in the supply temperature per unit time becomes smaller;
The heat source device according to claim 6 .

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